a/b = 4/5
a + b= 27 logo: a= 4b/5
4b/5 +b = 27
b=12
a= 15
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a/b = 4/5
a + b= 27 logo: a= 4b/5
4b/5 +b = 27
b=12
a= 15
SUBSTITUIINDO O VALOR DE A
4B/5+B=27
4B+5B=135
9B=135
B=135/9
B=15
A= 4X15/5
A=12